4. People who don’t exist; at least not yet
‘People who don’t exist; at least not yet’ discusses the non-identity problem by considering the analogy between the rules governing assisted reproduction and those governing adoption. It looks at the issues involved with comparing existence with non-existence, which considers the best interests of a child that is yet to be born, and then outlines the fundamental distinction between identity-preserving and identity-affecting actions. Three examples of the non-identity problem in which the actions are identity-affecting are discussed: preimplantation genetic testing, delaying pregnancy, and treating acne. It concludes that it is almost always wrong for doctors, or society generally, to refuse reproductive assistance on grounds of the welfare of the potential child.